A dental preform containing pre-sintered porous zirconia material, a method for its manufacture, and a dental product formed from said dental preform

摘要

1. A dental milling blank containing a pre-sintered porous zirconia material, wherein: a pre-sintered zirconia material is characterized by type IV adsorption and / or desorption isotherm N in accordance with the classification of the International Union of Theoretical and Applied Chemistry (IUPAC), - a pre-sintered zirconia material has a Vickers hardness of from about 25 to about 150, while the dental milling blank contains means To its reversible attachment to a device for mechanical processing.2. A dental blank for milling according to the preceding paragraph, characterized in that the porous pre-sintered zirconia material is characterized by at least one of the following features: - an adsorption and desorption nitrogen isotherm having a hysteresis loop; - a hysteresis loop of type H1 in accordance with the IUPAC classification; - isotherm adsorption and desorption of N having a hysteresis loop in the r / mouth interval of 0.70 to 0.95; - an average diameter of bound pores from about 10 nm to about 100 nm; - an average grain size of е approximately 100 nm; - specific surface area by the BET method from approximately 10 m / g to approximately 200 m / g; - bending strength in two axes from approximately 10 to approximately 40; - geometric dimension in the x, y, z directions at least at least 5 mm; - Vickers hardness from about 25 to about 150; - density from about 30% to about 95% of theoretical density; - isotropic nature of shrinkage deformation. 3. Dental blank for milling according